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一、准确预报,适时用药根据当地(市)县植保站定期发布的虫情测报,结合棉田植株定期定点调查判断防治最佳时期。春棉二代田间累计百株卵量200粒、三代80粒、四代100粒;夏棉百株累计卵量100粒。田间幼虫数百株累计8～15头即是防治最佳时期。要严防人为的定期定时防治方法。 二、合理使用复配农药 使用复配农药要根据各种农药的机理合理复配,可以现配现用,也可先配后用。如菊酯类与有机磷类复配、有机磷与有机磷复配等,要求配合后的农药高效、低毒。比如:菊酯类的功夫和有机磷类甲胺磷1:4可以增加药效几倍。 三、交替轮换用药 一种农药全程使用次数不宜超过三次,每代防治中只许使用一次。1代可用Bt类生物制剂兼治麦蚜虫;2、3代可用不同类型的有
First, accurate forecast, timely medication According to the local (city) County plant protection station regularly released pest detection report, combined with cotton plants regularly sentinel survey to determine the best time to prevent and control. The second generation of spring cotton field total of 100 oocysts of 100, three generations of 80, four generations of 100; summer cotton 100 eggs accumulated 100. Hundreds of field larvae accumulated a total of 8 to 15 that is the best time to control. To prevent man-made regular regular control methods. Second, the rational use of complex pesticides The use of complex pesticides according to a variety of pesticides reasonable mechanism of complex, can be allocated with the current, but also after the first allocation. If pyrethroids and organic phosphorus complex, organic phosphorus and organic phosphorus complex, with the requirements of pesticides after the high efficiency, low toxicity. For example: pyrethroid Kung Fu and organic phosphorus methamidophos 1: 4 can increase the efficacy several times. Third, alternate rotation of a pesticide The number of full use of pesticides should not exceed three times, each generation only control the use of once. 1 generation available Bt biological agents and treat wheat aphids; 2,3 generations available different types of